Crystal Structure and Luminescence of Lanthanide Monodentate Complexes [Ln(C4N4H6O)2(H2O)6]Cl3 and [Ln(C4N4H6O)2(H2O)3(NO3)3] (Ln = Tb or Eu)

New eight- and nine-coordinate luminescent europium(III) and terbium(III) complexes 1-4 with carbonyl group coordination have been prepared using the monodentate ligand (L) 2,4-diamino-6-hydroxy pyrimidine and characterized by X-ray and spectroscopic methods.